GR Observer

Hey Community,

is there a way to calculate the *GR *Observer (Glare Rating) in Radiance?
GR is the measure of glare in exterior spaces.

My attempt is to use HDR photos and analyze a scene in exterior, mainly at
an Airport field: Apron, Aircraft Stands.

Thank you in advance,

and Congrats GREG! :slight_smile:

Mit freundlichen Gr眉ssen,

Josef.Nassif

Dipl.-Ing. Elektrotechnik

MA(FH) Architectural Lighting Design

Thanks, Josef.

Do you happen to have a reference or a formula for GR? It's not the same as UGR, is it? There are so many glare indices, and the findglare and glarendx programs can be combined to compute several of them from HDR images or renderings, but I don't know about this one.

Cheers,
-Greg

路路路

From: "N. Nassif" <[email protected]>
Date: May 17, 2018 1:15:55 PM PDT

Hey Community,

is there a way to calculate the GR Observer (Glare Rating) in Radiance? GR is the measure of glare in exterior spaces.

My attempt is to use HDR photos and analyze a scene in exterior, mainly at an Airport field: Apron, Aircraft Stands.

Thank you in advance,

and Congrats GREG! :slight_smile:

Mit freundlichen Gr眉ssen,

Josef.Nassif
Dipl.-Ing. Elektrotechnik
MA(FH) Architectural Lighting Design

Hey,

I found this online from AGI32:

https://docs.agi32.com/AGi32/Content/adding_calculation_points/Calculations_Glare_Rating_Concepts.htm

The Formula is GR = 27 + 24 lg (LVL/LVE ^0.9)

I checked the ones you sent (findglare and glarendx ), but I did see it, or
am I mistaken?

Thank you!

Mit freundlichen Gr眉ssen,

Josef.Nassif

Dipl.-Ing. Elektrotechnik

MA(FH) Architectural Lighting Design

路路路

2018-05-18 2:51 GMT+02:00 <[email protected]>:

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Today's Topics:

聽聽聽1. GR Observer (N. Nassif)
聽聽聽2. Re: Daylight Award! (Mudit Saxena)
聽聽聽3. Re: GR Observer (Greg Ward)
聽聽聽4. Re: Daylight Award! (Amarpreet Sethi)

----------------------------------------------------------------------

Message: 1
Date: Thu, 17 May 2018 22:15:55 +0200
From: "N. Nassif" <[email protected]>
To: [email protected]
Subject: [Radiance-general] GR Observer
Message-ID:
聽聽聽聽聽聽聽聽<CAOQvQdnvZ9D1ynZNc-oo2TeXvu5Y3h_5iuK9DPVxN5dJ0rYCGA@mail.
gmail.com>
Content-Type: text/plain; charset="utf-8"

Hey Community,

is there a way to calculate the *GR *Observer (Glare Rating) in Radiance?
GR is the measure of glare in exterior spaces.

My attempt is to use HDR photos and analyze a scene in exterior, mainly at
an Airport field: Apron, Aircraft Stands.

Thank you in advance,

and Congrats GREG! :slight_smile:

Mit freundlichen Gr?ssen,

Josef.Nassif

Dipl.-Ing. Elektrotechnik

MA(FH) Architectural Lighting Design
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------------------------------

Message: 2
Date: Thu, 17 May 2018 13:24:02 -0700
From: Mudit Saxena <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Daylight Award!
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"

This made my day!! So well deserved Greg!! Your humble response reminds us
just why you deserve this award. Your selfless and devoted support of the
Radiance community over the years has helped countless people. I hope I can
echo some of those people in saying Thank You and Congratulations!

Mudit Saxena
Principal, Vistar Energy
www.vistar-energy.com
+1 (916) 543-7186 | [email protected]

> On May 17, 2018, at 8:34 AM, Randolph M. Fritz <[email protected]> > wrote:
>
> Congratulations, Greg!
>
> --
> Randolph M. Fritz || +1 206 659-8617 || [email protected]
>
>> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell <[email protected]> > wrote:
>> Congratulations to Greg Ward for receiving the prestigious 2018 Velux
Daylight Award for Daylight Research!
>>
>>
>>
>> http://www.thedaylightaward.com/laureates/
>>
>>
>>
>> I?m sure all of us on this list could not imagine a more deserving
recipient for this award given his contributions to the field, and the
legacy he has created with Radiance.
>>
>>
>>
>> Congrats Greg!
>>
>>
>>
>> --
>>
>> Galen Burrell LEED AP
>>
>> Senior Designer | Lighting
>>
>>
>>
>> Arup
>>
>> t: +1 415 957 9445 d: +1 415 946 2367
>>
>> m: +1 415 906 9191
>>
>> www.arup.com
>>
>>
>>
>> ____________________________________________________________
>> Electronic mail messages entering and leaving Arup business
>> systems are scanned for viruses and acceptability of content
>>
>>
>> _______________________________________________
>> Radiance-general mailing list
>> [email protected]
>> https://www.radiance-online.org/mailman/listinfo/radiance-general
>>
>
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Message: 3
Date: Thu, 17 May 2018 15:21:41 -0700
From: Greg Ward <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] GR Observer
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"

Thanks, Josef.

Do you happen to have a reference or a formula for GR? It's not the same
as UGR, is it? There are so many glare indices, and the findglare and
鈥嬧
glarendx programs can be combined to compute several of them from HDR
images or renderings, but I don't know about this one.

Cheers,
-Greg

> From: "N. Nassif" <[email protected]>
> Date: May 17, 2018 1:15:55 PM PDT
>
> Hey Community,
>
> is there a way to calculate the GR Observer (Glare Rating) in Radiance?
GR is the measure of glare in exterior spaces.
>
> My attempt is to use HDR photos and analyze a scene in exterior, mainly
at an Airport field: Apron, Aircraft Stands.
>
> Thank you in advance,
>
> and Congrats GREG! :slight_smile:
>
> Mit freundlichen Gr?ssen,
>
> Josef.Nassif
> Dipl.-Ing. Elektrotechnik
> MA(FH) Architectural Lighting Design
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Message: 4
Date: Fri, 18 May 2018 00:51:25 +0000
From: Amarpreet Sethi <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Daylight Award!
Message-ID:
聽聽聽聽聽聽聽聽<MWHPR14MB14212B9EB21F3137268D5C0D8A900@MWHPR14MB1421.
namprd14.prod.outlook.com>

Content-Type: text/plain; charset="utf-8"

Congratulations Greg and THANKYOU!!!

Amarpreet

On May 17, 2018, at 3:12 PM, Mudit Saxena <[email protected]< > mailto:[email protected]>> wrote:

This made my day!! So well deserved Greg!! Your humble response reminds us
just why you deserve this award. Your selfless and devoted support of the
Radiance community over the years has helped countless people. I hope I can
echo some of those people in saying Thank You and Congratulations!

Mudit Saxena
Principal, Vistar Energy
www.vistar-energy.com<http://www.vistar-energy.com>
+1 (916) 543-7186 | [email protected]<mailto:
[email protected]>

On May 17, 2018, at 8:34 AM, Randolph M. Fritz <[email protected]<mailto: > [email protected]>> wrote:

Congratulations, Greg!

--
Randolph M. Fritz || +1 206 659-8617 || [email protected]<mailto:rmfr
[email protected]>

On Wed, May 16, 2018 at 2:03 PM, Galen Burrell <[email protected]< > mailto:[email protected]>> wrote:
Congratulations to Greg Ward for receiving the prestigious 2018 Velux
Daylight Award for Daylight Research!

http://www.thedaylightaward.com/laureates/

I?m sure all of us on this list could not imagine a more deserving
recipient for this award given his contributions to the field, and the
legacy he has created with Radiance.

Congrats Greg!

--
Galen Burrell LEED AP
Senior Designer | Lighting

Arup
t: +1 415 957 9445 d: +1 415 946 2367
m: +1 415 906 9191
www.arup.com <http://www.arup.com/>

____________________________________________________________
Electronic mail messages entering and leaving Arup business
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Hi Josef,

Lvl of the equation is the veiling luminance according to Stiles-Holladay and used in the CIE publications for disability glare. You can calculate Lvl by evalglare, it is one of the outputs if you use the -d option. the evalglare output is called "Lveil_cie", dont mix it up with "Lveil", which is the disability equation according to Pointer and differs a lot to the CIE equation.

For your configuration, I would de-activate the peak extraction (by using the -x option) and use a meaningful absolute threshold for glare source detection (e.g. 2000 cd/m2).

The second part of the GR equation (Lve) cannot be solved by image-evaluation automatically, since it uses the average horizontal illuminance (not vertical). So you have to measure it separately and calculate the GR manually.

The bigger challenge is to measure accurately this situations with a HDR camera, since you will deal very probably with flicker (discharging lamps, led..). As a general rule you need to restrict the shortest exposure time to 10/f (f: frequency of the flicker). At the same time should be the maximum pixel value of the shortest exposure time not more than 200 (better lower) to avoid pixel overflow.

For high luminance light sources it is hard to comply with both rules at the same time. So you have to check, if you need to use a filter and use longer exposure times.

A second thing you have to consider is, that you need to have the right lens type description in the header of the hdr image ("VIEW=...") , otherwise the angles (e.g. angle between line of sight=center of image and the glare source or all solid angles) are not correctly calculated by any software (findglare, evalglare). For perspective lenses you need to check the viewing angles. This should be done by measurements, since manufacturers information or not always correct and the angles might differ for the same lens for different cameras attached to it.

Good luck!

Jan

路路路

On 18.05.18 10:22, N. Nassif wrote:

Hey,

I found this online from AGI32:

https://docs.agi32.com/AGi32/Content/adding_calculation_points/Calculations_Glare_Rating_Concepts.htm

The Formula is GR = 27 + 24 lg (LVL/LVE ^0.9)

I checked the ones you sent (findglare and glarendx ), but I did see it, or am I mistaken?

Thank you!

Mit freundlichen Gr眉ssen,

Josef.Nassif

Dipl.-Ing. Elektrotechnik

MA(FH) Architectural Lighting Design

2018-05-18 2:51 GMT+02:00 <[email protected] <mailto:[email protected]>>:

聽聽聽聽Send Radiance-general mailing list submissions to
聽聽聽聽[email protected]
聽聽聽聽<mailto:[email protected]>

聽聽聽聽To subscribe or unsubscribe via the World Wide Web, visit
聽聽聽聽https://www.radiance-online.org/mailman/listinfo/radiance-general
聽聽聽聽<https://www.radiance-online.org/mailman/listinfo/radiance-general>
聽聽聽聽or, via email, send a message with subject or body 'help' to
聽聽聽聽[email protected]
聽聽聽聽<mailto:[email protected]>

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聽聽聽聽When replying, please edit your Subject line so it is more specific
聽聽聽聽than "Re: Contents of Radiance-general digest..."

聽聽聽聽Today's Topics:

聽聽聽聽 1. GR Observer (N. Nassif)
聽聽聽聽 2. Re: Daylight Award! (Mudit Saxena)
聽聽聽聽 3. Re: GR Observer (Greg Ward)
聽聽聽聽 4. Re: Daylight Award! (Amarpreet Sethi)

聽聽聽聽----------------------------------------------------------------------

聽聽聽聽Message: 1
聽聽聽聽Date: Thu, 17 May 2018 22:15:55 +0200
聽聽聽聽From: "N. Nassif" <[email protected] <mailto:[email protected]>>
聽聽聽聽To: [email protected]
聽聽聽聽<mailto:[email protected]>
聽聽聽聽Subject: [Radiance-general] GR Observer
聽聽聽聽Message-ID:
聽聽聽聽
聽聽聽聽<CA[email protected]
聽聽聽聽<mailto:CA[email protected]>>
聽聽聽聽Content-Type: text/plain; charset="utf-8"

聽聽聽聽Hey Community,

聽聽聽聽is there a way to calculate the *GR *Observer (Glare Rating) in
聽聽聽聽Radiance?
聽聽聽聽GR is the measure of glare in exterior spaces.

聽聽聽聽My attempt is to use HDR photos and analyze a scene in exterior,
聽聽聽聽mainly at
聽聽聽聽an Airport field: Apron, Aircraft Stands.

聽聽聽聽Thank you in advance,

聽聽聽聽and Congrats GREG! :slight_smile:

聽聽聽聽Mit freundlichen Gr?ssen,

聽聽聽聽Josef.Nassif

聽聽聽聽Dipl.-Ing. Elektrotechnik

聽聽聽聽MA(FH) Architectural Lighting Design
聽聽聽聽-------------- next part --------------
聽聽聽聽An HTML attachment was scrubbed...
聽聽聽聽URL:
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聽聽聽聽<http://www.radiance-online.org/pipermail/radiance-general/attachments/20180517/f3dada8c/attachment-0001.html>>

聽聽聽聽------------------------------

聽聽聽聽Message: 2
聽聽聽聽Date: Thu, 17 May 2018 13:24:02 -0700
聽聽聽聽From: Mudit Saxena <[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽To: Radiance general discussion
聽聽聽聽<[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽Subject: Re: [Radiance-general] Daylight Award!
聽聽聽聽Message-ID:
聽聽聽聽<[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽Content-Type: text/plain; charset="utf-8"

聽聽聽聽This made my day!! So well deserved Greg!! Your humble response
聽聽聽聽reminds us just why you deserve this award. Your selfless and
聽聽聽聽devoted support of the Radiance community over the years has
聽聽聽聽helped countless people. I hope I can echo some of those people in
聽聽聽聽saying Thank You and Congratulations!

聽聽聽聽Mudit Saxena
聽聽聽聽Principal, Vistar Energy
聽聽聽聽www.vistar-energy.com <http://www.vistar-energy.com>
聽聽聽聽+1 (916) 543-7186 | [email protected]
聽聽聽聽<mailto:[email protected]>

聽聽聽聽> On May 17, 2018, at 8:34 AM, Randolph M. Fritz > <[email protected] <mailto:[email protected]>> wrote:
聽聽聽聽>
聽聽聽聽> Congratulations, Greg!
聽聽聽聽>
聽聽聽聽> --
聽聽聽聽> Randolph M. Fritz || +1 206 659-8617 || [email protected]
聽聽聽聽<mailto:[email protected]>
聽聽聽聽>
聽聽聽聽>> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell > <[email protected] <mailto:[email protected]>> wrote:
聽聽聽聽>> Congratulations to Greg Ward for receiving the prestigious 2018
聽聽聽聽Velux Daylight Award for Daylight Research!
聽聽聽聽>>
聽聽聽聽>> http://www.thedaylightaward.com/laureates/
聽聽聽聽<http://www.thedaylightaward.com/laureates/>
聽聽聽聽>>
聽聽聽聽>> I?m sure all of us on this list could not imagine a more
聽聽聽聽deserving recipient for this award given his contributions to the
聽聽聽聽field, and the legacy he has created with Radiance.
聽聽聽聽>>
聽聽聽聽>> Congrats Greg!
聽聽聽聽>>
聽聽聽聽>> --
聽聽聽聽>>
聽聽聽聽>> Galen Burrell LEED AP
聽聽聽聽>>
聽聽聽聽>> Senior Designer | Lighting
聽聽聽聽>>
聽聽聽聽>> Arup
聽聽聽聽>>
聽聽聽聽>> t: +1 415 957 9445 d: +1 415 946 2367
聽聽聽聽>>
聽聽聽聽>> m: +1 415 906 9191
聽聽聽聽>>
聽聽聽聽>> www.arup.com <http://www.arup.com>
聽聽聽聽>>
聽聽聽聽>> ____________________________________________________________
聽聽聽聽>> Electronic mail messages entering and leaving Arup business
聽聽聽聽>> systems are scanned for viruses and acceptability of content
聽聽聽聽>>
聽聽聽聽>> _______________________________________________
聽聽聽聽>> Radiance-general mailing list
聽聽聽聽>> [email protected]
聽聽聽聽<mailto:[email protected]>
聽聽聽聽>>
聽聽聽聽https://www.radiance-online.org/mailman/listinfo/radiance-general
聽聽聽聽<https://www.radiance-online.org/mailman/listinfo/radiance-general>
聽聽聽聽>>
聽聽聽聽>
聽聽聽聽> _______________________________________________
聽聽聽聽> Radiance-general mailing list
聽聽聽聽> [email protected]
聽聽聽聽<mailto:[email protected]>
聽聽聽聽>
聽聽聽聽https://www.radiance-online.org/mailman/listinfo/radiance-general
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聽聽聽聽------------------------------

聽聽聽聽Message: 3
聽聽聽聽Date: Thu, 17 May 2018 15:21:41 -0700
聽聽聽聽From: Greg Ward <[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽To: Radiance general discussion
聽聽聽聽<[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽Subject: Re: [Radiance-general] GR Observer
聽聽聽聽Message-ID: <[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽Content-Type: text/plain; charset="iso-8859-1"

聽聽聽聽Thanks, Josef.

聽聽聽聽Do you happen to have a reference or a formula for GR? It's not
聽聽聽聽the same as UGR, is it? There are so many glare indices, and the
聽聽聽聽findglare and
聽聽聽聽鈥嬧
聽聽聽聽glarendx programs can be combined to compute several of them from
聽聽聽聽HDR images or renderings, but I don't know about this one.

聽聽聽聽Cheers,
聽聽聽聽-Greg

聽聽聽聽> From: "N. Nassif" <[email protected] <mailto:[email protected]>>
聽聽聽聽> Date: May 17, 2018 1:15:55 PM PDT
聽聽聽聽>
聽聽聽聽> Hey Community,
聽聽聽聽>
聽聽聽聽> is there a way to calculate the GR Observer (Glare Rating) in
聽聽聽聽Radiance? GR is the measure of glare in exterior spaces.
聽聽聽聽>
聽聽聽聽> My attempt is to use HDR photos and analyze a scene in exterior,
聽聽聽聽mainly at an Airport field: Apron, Aircraft Stands.
聽聽聽聽>
聽聽聽聽> Thank you in advance,
聽聽聽聽>
聽聽聽聽> and Congrats GREG! :slight_smile:
聽聽聽聽>
聽聽聽聽> Mit freundlichen Gr?ssen,
聽聽聽聽>
聽聽聽聽> Josef.Nassif
聽聽聽聽> Dipl.-Ing. Elektrotechnik
聽聽聽聽> MA(FH) Architectural Lighting Design
聽聽聽聽-------------- next part --------------
聽聽聽聽An HTML attachment was scrubbed...
聽聽聽聽URL:
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聽聽聽聽<http://www.radiance-online.org/pipermail/radiance-general/attachments/20180517/7a95c876/attachment-0001.html>>

聽聽聽聽------------------------------

聽聽聽聽Message: 4
聽聽聽聽Date: Fri, 18 May 2018 00:51:25 +0000
聽聽聽聽From: Amarpreet Sethi <[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽To: Radiance general discussion
聽聽聽聽<[email protected]
聽聽聽聽<mailto:[email protected]>>
聽聽聽聽Subject: Re: [Radiance-general] Daylight Award!
聽聽聽聽Message-ID:
聽聽聽聽
聽聽聽聽<MWHPR14MB14212[email protected]
聽聽聽聽<mailto:MWHPR14MB14212[email protected]>>

聽聽聽聽Content-Type: text/plain; charset="utf-8"

聽聽聽聽Congratulations Greg and THANKYOU!!!

聽聽聽聽Amarpreet

聽聽聽聽On May 17, 2018, at 3:12 PM, Mudit Saxena > <[email protected] > <mailto:[email protected]><mailto:[email protected] > <mailto:[email protected]>>> wrote:

聽聽聽聽This made my day!! So well deserved Greg!! Your humble response
聽聽聽聽reminds us just why you deserve this award. Your selfless and
聽聽聽聽devoted support of the Radiance community over the years has
聽聽聽聽helped countless people. I hope I can echo some of those people in
聽聽聽聽saying Thank You and Congratulations!

聽聽聽聽Mudit Saxena
聽聽聽聽Principal, Vistar Energy
聽聽聽聽www.vistar-energy.com
聽聽聽聽<http://www.vistar-energy.com><http://www.vistar-energy.com
聽聽聽聽<http://www.vistar-energy.com>>
聽聽聽聽+1 (916) 543-7186 | [email protected]
聽聽聽聽<mailto:[email protected]><mailto:[email protected]
聽聽聽聽<mailto:[email protected]>>

聽聽聽聽On May 17, 2018, at 8:34 AM, Randolph M. Fritz <[email protected] > <mailto:[email protected]><mailto:[email protected] > <mailto:[email protected]>>> wrote:

聽聽聽聽Congratulations, Greg!

聽聽聽聽--
聽聽聽聽Randolph M. Fritz || +1 206 659-8617 || [email protected]
聽聽聽聽<mailto:[email protected]><mailto:[email protected]
聽聽聽聽<mailto:[email protected]>>

聽聽聽聽On Wed, May 16, 2018 at 2:03 PM, Galen Burrell > <[email protected] > <mailto:[email protected]><mailto:[email protected] > <mailto:[email protected]>>> wrote:
聽聽聽聽Congratulations to Greg Ward for receiving the prestigious 2018
聽聽聽聽Velux Daylight Award for Daylight Research!

聽聽聽聽http://www.thedaylightaward.com/laureates/
聽聽聽聽<http://www.thedaylightaward.com/laureates/>

聽聽聽聽I?m sure all of us on this list could not imagine a more deserving
聽聽聽聽recipient for this award given his contributions to the field, and
聽聽聽聽the legacy he has created with Radiance.

聽聽聽聽Congrats Greg!

聽聽聽聽--
聽聽聽聽Galen Burrell LEED AP
聽聽聽聽Senior Designer | Lighting

聽聽聽聽Arup
聽聽聽聽t: +1 415 957 9445 d: +1 415 946 2367
聽聽聽聽m: +1 415 906 9191
聽聽聽聽www.arup.com <http://www.arup.com> <http://www.arup.com/>

聽聽聽聽____________________________________________________________
聽聽聽聽Electronic mail messages entering and leaving Arup business
聽聽聽聽systems are scanned for viruses and acceptability of content

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聽聽聽聽Radiance-general mailing list
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聽聽聽聽End of Radiance-general Digest, Vol 171, Issue 14
聽聽聽聽*************************************************

_______________________________________________
Radiance-general mailing list
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--
Dr.-Ing. Jan Wienold
Ecole Polytechnique F茅d茅rale de Lausanne (EPFL)
EPFL ENAC IA LIPID

http://people.epfl.ch/jan.wienold
LE 1 111 (Office)
Phone +41 21 69 30849

Hallo Jan,

Thank you for your explicit answer. I will check it out!

Mit freundlichen Gr眉ssen,

Josef.Nassif

Dipl.-Ing. Elektrotechnik

MA(FH) Architectural Lighting Design

路路路

2018-05-18 11:34 GMT+02:00 <[email protected]>:

Send Radiance-general mailing list submissions to
聽聽聽聽聽聽聽聽[email protected]

To subscribe or unsubscribe via the World Wide Web, visit
聽聽聽聽聽聽聽聽https://www.radiance-online.org/mailman/listinfo/radiance-general
or, via email, send a message with subject or body 'help' to
聽聽聽聽聽聽聽聽[email protected]

You can reach the person managing the list at
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When replying, please edit your Subject line so it is more specific
than "Re: Contents of Radiance-general digest..."

Today's Topics:

聽聽聽1. Re: Daylight Award! (Jan Walter)
聽聽聽2. Re: 3. Re: GR Observer (Greg Ward) (Jan Wienold)

----------------------------------------------------------------------

Message: 1
Date: Fri, 18 May 2018 09:51:09 +0100
From: Jan Walter <[email protected]>
To: Radiance general discussion <[email protected]>
Subject: Re: [Radiance-general] Daylight Award!
Message-ID:
聽聽聽聽聽聽聽聽<CAKXUb-CZrosjcKeV76Hth8bizryf6-GzZFPJW9F7Xnd-j7UtaQ@mail.
gmail.com>
Content-Type: text/plain; charset="UTF-8"

Congratulations, Greg!

On Wed, May 16, 2018 at 10:03 PM, Galen Burrell <[email protected]> > wrote:
> Congratulations to Greg Ward for receiving the prestigious 2018 Velux
> Daylight Award for Daylight Research!

------------------------------

Message: 2
Date: Fri, 18 May 2018 11:33:57 +0200
From: Jan Wienold <[email protected]>
To: [email protected]
Subject: Re: [Radiance-general] 3. Re: GR Observer (Greg Ward)
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hi Josef,

Lvl of the equation is the veiling luminance according to
Stiles-Holladay and used in the CIE publications for disability glare.
You can calculate Lvl by evalglare, it is one of the outputs if you use
the -d option. the evalglare output is called "Lveil_cie", dont mix it
up with "Lveil", which is the disability equation according to Pointer
and differs a lot to the CIE equation.

For your configuration, I would de-activate the peak extraction (by
using the -x option) and use a meaningful absolute threshold for glare
source detection (e.g. 2000 cd/m2).

The second part of the GR equation (Lve) cannot be solved by
image-evaluation automatically, since it uses the average horizontal?
illuminance (not vertical). So you have to measure it separately and
calculate the GR manually.

The bigger challenge is to measure accurately this situations with a HDR
camera, since you will deal very probably with flicker (discharging
lamps, led..). As a general rule you need to restrict the shortest
exposure time to 10/f (f: frequency of the flicker). At the same time
should be the maximum pixel value of the shortest exposure time not more
than 200 (better lower) to avoid pixel overflow.

For high luminance light sources it is hard to comply with both rules at
the same time. So you have to check, if you need to use a filter and use
longer exposure times.

A second thing you have to consider is, that you need to have the right
lens type description in the header of the hdr image ("VIEW=...") ,
otherwise the angles (e.g. angle between line of sight=center of image
and the glare source or all solid angles) are not correctly calculated
by any software (findglare, evalglare). For perspective lenses you need
to check the viewing angles. This should be done by measurements, since
manufacturers information or not always correct and the angles might
differ for the same lens for different cameras attached to it.

Good luck!

Jan

On 18.05.18 10:22, N. Nassif wrote:
> Hey,
>
> I found this online from AGI32:
>
> https://docs.agi32.com/AGi32/Content/adding_calculation_
points/Calculations_Glare_Rating_Concepts.htm
>
> The Formula is GR = 27 + 24 lg (LVL/LVE?^0.9)
>
> I checked the ones you sent (findglare and glarendx?), but I did see
> it, or am I mistaken?
>
> Thank you!
>
> Mit freundlichen Gr?ssen,
>
> Josef.Nassif
>
> Dipl.-Ing. Elektrotechnik
>
> MA(FH) Architectural Lighting Design
>
>
> 2018-05-18 2:51 GMT+02:00
> <[email protected]
> <mailto:[email protected]>>:
>
> Send Radiance-general mailing list submissions to
> [email protected]
> <mailto:[email protected]>
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://www.radiance-online.org/mailman/listinfo/radiance-general
> <https://www.radiance-online.org/mailman/listinfo/radiance-general>
> or, via email, send a message with subject or body 'help' to
> [email protected]
> <mailto:[email protected]>
>
> You can reach the person managing the list at
> [email protected]
> <mailto:[email protected]>
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Radiance-general digest..."
>
>
> Today's Topics:
>
> ? ?1. GR Observer (N. Nassif)
> ? ?2. Re: Daylight Award! (Mudit Saxena)
> ? ?3. Re: GR Observer (Greg Ward)
> ? ?4. Re: Daylight Award! (Amarpreet Sethi)
>
>
> ------------------------------------------------------------
----------
>
> Message: 1
> Date: Thu, 17 May 2018 22:15:55 +0200
> From: "N. Nassif" <[email protected] <mailto:[email protected]>>
> To: [email protected]
> <mailto:[email protected]>
> Subject: [Radiance-general] GR Observer
> Message-ID:
> ? ? ? ?
> <CA[email protected]
> <mailto:CAOQvQdnvZ9D1ynZNc-oo2TeXvu5Y3h_5iuK9DPVxN5dJ0rYCGA@mail.
gmail.com>>
> Content-Type: text/plain; charset="utf-8"
>
> Hey Community,
>
> is there a way to calculate the *GR *Observer (Glare Rating) in
> Radiance?
> GR is the measure of glare in exterior spaces.
>
> My attempt is to use HDR photos and analyze a scene in exterior,
> mainly at
> an Airport field: Apron, Aircraft Stands.
>
> Thank you in advance,
>
> and Congrats GREG! :slight_smile:
>
> Mit freundlichen Gr?ssen,
>
>
>
> Josef.Nassif
>
> Dipl.-Ing. Elektrotechnik
>
> MA(FH) Architectural Lighting Design
> -------------- next part --------------
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> <http://www.radiance-online.org/pipermail/radiance-
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general/attachments/20180517/f3dada8c/attachment-0001.html>>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 17 May 2018 13:24:02 -0700
> From: Mudit Saxena <[email protected]
> <mailto:[email protected]>>
> To: Radiance general discussion
> <[email protected]
> <mailto:[email protected]>>
> Subject: Re: [Radiance-general] Daylight Award!
> Message-ID:
> <[email protected]
> <mailto:[email protected]>>
> Content-Type: text/plain; charset="utf-8"
>
> This made my day!! So well deserved Greg!! Your humble response
> reminds us just why you deserve this award. Your selfless and
> devoted support of the Radiance community over the years has
> helped countless people. I hope I can echo some of those people in
> saying Thank You and Congratulations!
>
>
> Mudit Saxena
> Principal, Vistar Energy
> www.vistar-energy.com <http://www.vistar-energy.com>
> +1 (916) 543-7186? | [email protected]
> <mailto:[email protected]>
>
>
> > On May 17, 2018, at 8:34 AM, Randolph M. Fritz > > <[email protected] <mailto:[email protected]>> wrote:
> >
> > Congratulations, Greg!
> >
> > --
> > Randolph M. Fritz || +1 206 659-8617 || [email protected]
> <mailto:[email protected]>
> >
> >> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell > > <[email protected] <mailto:[email protected]>> wrote:
> >> Congratulations to Greg Ward for receiving the prestigious 2018
> Velux Daylight Award for Daylight Research!
> >>
> >>
> >>
> >> http://www.thedaylightaward.com/laureates/
> <http://www.thedaylightaward.com/laureates/>
> >>
> >>
> >>
> >> I?m sure all of us on this list could not imagine a more
> deserving recipient for this award given his contributions to the
> field, and the legacy he has created with Radiance.
> >>
> >>
> >>
> >> Congrats Greg!
> >>
> >>
> >>
> >> --
> >>
> >> Galen Burrell? LEED AP
> >>
> >> Senior Designer | Lighting
> >>
> >>
> >>
> >> Arup
> >>
> >> t: +1 415 957 9445? d: +1 415 946 2367
> >>
> >> m: +1 415 906 9191
> >>
> >> www.arup.com <http://www.arup.com>
> >>
> >>
> >>
> >> ____________________________________________________________
> >> Electronic mail messages entering and leaving Arup business
> >> systems are scanned for viruses and acceptability of content
> >>
> >>
> >> _______________________________________________
> >> Radiance-general mailing list
> >> [email protected]
> <mailto:[email protected]>
> >>
> https://www.radiance-online.org/mailman/listinfo/radiance-general
> <https://www.radiance-online.org/mailman/listinfo/radiance-general>
> >>
> >
> > _______________________________________________
> > Radiance-general mailing list
> > [email protected]
> <mailto:[email protected]>
> >
> https://www.radiance-online.org/mailman/listinfo/radiance-general
> <https://www.radiance-online.org/mailman/listinfo/radiance-general>
> -------------- next part --------------
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> URL:
> <http://www.radiance-online.org/pipermail/radiance-
general/attachments/20180517/3ad6940f/attachment-0001.html
> <http://www.radiance-online.org/pipermail/radiance-
general/attachments/20180517/3ad6940f/attachment-0001.html>>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 17 May 2018 15:21:41 -0700
> From: Greg Ward <[email protected]
> <mailto:[email protected]>>
> To: Radiance general discussion
> <[email protected]
> <mailto:[email protected]>>
> Subject: Re: [Radiance-general] GR Observer
> Message-ID: <[email protected]
> <mailto:[email protected]>>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thanks, Josef.
>
> Do you happen to have a reference or a formula for GR? It's not
> the same as UGR, is it?? There are so many glare indices, and the
> findglare and
> ??
> glarendx programs can be combined to compute several of them from
> HDR images or renderings, but I don't know about this one.
>
> Cheers,
> -Greg
>
> > From: "N. Nassif" <[email protected] <mailto:[email protected]>>
> > Date: May 17, 2018 1:15:55 PM PDT
> >
> > Hey Community,
> >
> > is there a way to calculate the GR Observer (Glare Rating) in
> Radiance? GR is the measure of glare in exterior spaces.
> >
> > My attempt is to use HDR photos and analyze a scene in exterior,
> mainly at an Airport field: Apron, Aircraft Stands.
> >
> > Thank you in advance,
> >
> > and Congrats GREG! :slight_smile:
> >
> > Mit freundlichen Gr?ssen,
> >
> > Josef.Nassif
> > Dipl.-Ing. Elektrotechnik
> > MA(FH) Architectural Lighting Design
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> <http://www.radiance-online.org/pipermail/radiance-
general/attachments/20180517/7a95c876/attachment-0001.html
> <http://www.radiance-online.org/pipermail/radiance-
general/attachments/20180517/7a95c876/attachment-0001.html>>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 18 May 2018 00:51:25 +0000
> From: Amarpreet Sethi <[email protected]
> <mailto:[email protected]>>
> To: Radiance general discussion
> <[email protected]
> <mailto:[email protected]>>
> Subject: Re: [Radiance-general] Daylight Award!
> Message-ID:
> ? ? ? ?
> <MWHPR14MB14212B9EB21F3137268D5C0D8A900@MWHPR14MB1421.
namprd14.prod.outlook.com
> <mailto:MWHPR14MB14212B9EB21F3137268D5C0D8A900@
MWHPR14MB1421.namprd14.prod.outlook.com>>
>
> Content-Type: text/plain; charset="utf-8"
>
> Congratulations Greg and THANKYOU!!!
>
> Amarpreet
>
> On May 17, 2018, at 3:12 PM, Mudit Saxena > > <[email protected] > > <mailto:[email protected]><mailto:[email protected] > > <mailto:[email protected]>>> wrote:
>
> This made my day!! So well deserved Greg!! Your humble response
> reminds us just why you deserve this award. Your selfless and
> devoted support of the Radiance community over the years has
> helped countless people. I hope I can echo some of those people in
> saying Thank You and Congratulations!
>
>
> Mudit Saxena
> Principal, Vistar Energy
> www.vistar-energy.com
> <http://www.vistar-energy.com><http://www.vistar-energy.com
> <http://www.vistar-energy.com>>
> +1 (916) 543-7186? | [email protected]
> <mailto:[email protected]><mailto:[email protected]
> <mailto:[email protected]>>
>
>
> On May 17, 2018, at 8:34 AM, Randolph M. Fritz <[email protected] > > <mailto:[email protected]><mailto:[email protected] > > <mailto:[email protected]>>> wrote:
>
> Congratulations, Greg!
>
> --
> Randolph M. Fritz || +1 206 659-8617 || [email protected]
> <mailto:[email protected]><mailto:[email protected]
> <mailto:[email protected]>>
>
> On Wed, May 16, 2018 at 2:03 PM, Galen Burrell > > <[email protected] > > <mailto:[email protected]><mailto:[email protected] > > <mailto:[email protected]>>> wrote:
> Congratulations to Greg Ward for receiving the prestigious 2018
> Velux Daylight Award for Daylight Research!
>
> http://www.thedaylightaward.com/laureates/
> <http://www.thedaylightaward.com/laureates/>
>
> I?m sure all of us on this list could not imagine a more deserving
> recipient for this award given his contributions to the field, and
> the legacy he has created with Radiance.
>
> Congrats Greg!
>
> --
> Galen Burrell? LEED AP
> Senior Designer | Lighting
>
> Arup
> t: +1 415 957 9445? d: +1 415 946 2367
> m: +1 415 906 9191
> www.arup.com <http://www.arup.com> <http://www.arup.com/>
>
>
> ____________________________________________________________
> Electronic mail messages entering and leaving Arup business
> systems are scanned for viruses and acceptability of content
>
> _______________________________________________
> Radiance-general mailing list
> [email protected]
> <mailto:[email protected]><mailto:Ra
[email protected]
> <mailto:[email protected]>>
> https://www.radiance-online.org/mailman/listinfo/radiance-general
> <https://www.radiance-online.org/mailman/listinfo/radiance-general>
>
>
> _______________________________________________
> Radiance-general mailing list
> [email protected]
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> https://www.radiance-online.org/mailman/listinfo/radiance-general
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> _______________________________________________
> Radiance-general mailing list
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>
> Subject: Digest Footer
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> ------------------------------
>
> End of Radiance-general Digest, Vol 171, Issue 14
> *************************************************
>
>
>
>
> _______________________________________________
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--
Dr.-Ing. Jan Wienold
Ecole Polytechnique F?d?rale de Lausanne (EPFL)
EPFL ENAC IA LIPID

http://people.epfl.ch/jan.wienold
LE 1 111 (Office)
Phone +41 21 69 30849

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